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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d9e97c64b55fb951d3affed61c6136d0456b557bf4094cde5670e5001fe5227' 
  AND token = 'vsfA7JzleF0fwAcEnV2YYaV9/pee4D0Y4ogEdjwuTlo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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