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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb819a8e41185c0b7068bcc329b5b3c3d4c916b31b3c53fa2520165c4394409c' 
  AND token = 'z51lRsr+TYec3nPr0uLM/lLl2iOISrRW/C52t6yU1lk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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