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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a63d7d4fad5f1b9aa6e4b93f464b35cb83783922040941527beb315df1406da' 
  AND token = '1hmnM9E9T9IN/kVwSWizfIOMCH85/gFh47ZgTppD8YQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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