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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcf6276d331640312e5e63a28af4419d4c1bdf3c41847d09a5d04b1b117f8ca1' 
  AND token = 'fQT3pqL3zlGwn3ZdXg9W0sHGcflCT1IJmmnKt5bXqOw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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