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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aea7a3397eb2e93eca967715079c69e69145adee6a0f578047b97ed9f7d43825' 
  AND token = '8jObTn4459cd6Xs8VSGSGhvofGs2qlzJ7GwxY7bi1gQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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