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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99a77629491149d7053f6af60ca2ff881f13ac0b0fdbe67d1542a5bf966f7699' 
  AND token = 'QXQe48kqFzW+QLW+FZE66Rvm5PpEjZOiSoPAu4CdN4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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