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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd67db636b6cd266159773c2bd59eadb61089a9ae44eca3fa2cefe7c41f2595a' 
  AND token = 'L8v+HVoOdPlIrJnbMH3an6KrPdZHGI0kL1brRgPA6+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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