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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c7fc863b358c99eafd5ef78cc8459efffa18fbd15a9da0d44942a1882a4f0ec' 
  AND token = '/XcM498/3iSHnPIQsUm74hxfBtkRW2/4uc9Jmz+Te3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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