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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1a3fa75326542b00ceadf13ec1622292d7f4c0c032cbe6d66d836cdb2ba03af' 
  AND token = 'hTTLPwm3toZwGzgwUxv59d5dd9K21js5O6vIz0pXnzw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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