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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e25545466b359183c60942dbf1cb91d7275e95300f77870b3a70a5db8d2b1409' 
  AND token = 'b4uxTKkmGxhA1huKnAl3HYXaCl8Ges6YFKwfdh9UwnM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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