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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '352ebc099d29d4479d713884e6b11be3fc5307e037e01e89bfcc62cf5e37bf93' 
  AND token = 'C9iSjJG3xQP3RNHPgmNJ9+RirRBqUCM7rXfsM9KHxYw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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