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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc0f355c432e2d9b93c3819619511d18e34c360e27f2c96ba5aadcc0d1e6e82b' 
  AND token = 'O06BOTx1hDfc0sffVh1cwekg/yjtB84y6uswwDgWLwY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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