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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b35376c7caf3ae183a96229cef8c3af754b8c5f99fd7b26c042bedf86a58eab' 
  AND token = 'cj0zSGzzv5n9EoAeOrChL9MVe46NN17s2CmG4iNFfwU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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