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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea9b691623b3ad21e47cba27d0d0808044db5ad0667338a40a41b16c90202bd3' 
  AND token = 'nD9WJt4MGif2ybiVMClBRlBXYbMbvm04MqY/UKsaCy0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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