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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6dd70bf99db3ad1ca09079d4d6ba14821c09646106dfcd7a2ab1b4d11e8d5c97' 
  AND token = 'c2o8pJRO6RlSjhTppqkHK0zmS3c9VCh0ySsnO9NNswA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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