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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b285b2b0e38ccd8dd7ebd2ae76b5dab172352aeff55d404a74bf4fe8ba74e97e' 
  AND token = '4VRHWFHjQIxkSGH7fuGPcwRJGdbV7jV9lnP7W35/gw8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}