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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '098d8f1f1c7be95503c673926b4c58478272092a1ce2f6c22d1be39b32be2d83' 
  AND token = 'd6dlabMHVDusMVIfsn3tKMXB9lH/LiX+PMSwPVnFhkA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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