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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfd2a2ad80f410a0880c77862c7413c4111c0db1e203577a62f7b50174b8d615' 
  AND token = 'jBtS3uqcphoxSQCiC3YMUv1G4qWnRsgqkg4YOIbauNA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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