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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8abf43ad3e693abf6821e3344cf2834520db7637bd14f71b0062e1d7a59a02f' 
  AND token = 'UyuJJLR2xkQE1szDrA3cpIM0n/8r/a9UJ8XXgXY9QR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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