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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61e635aaedd24f8034c4cf1ecf4ac371ad25a0e83835433e380f615b4fa85737' 
  AND token = '+Pp6H4QSiAmNas7vsBounlM/zdjpSPl6cWp1NbrQuLM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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