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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3003c7ab5871e475edf8bb515fa825f4cf756cc102c4fcfdf878feba31dac9f1' 
  AND token = 'qtKCRMJ25kcvhvKLoqZEYaPQna0wQBQU1jzX0tjKoa0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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