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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81814bd0775c78de9943625c38cb31bfc404ae4b9332b9f182e6b76af409c7db' 
  AND token = '8qoVqpHE8wz7cBRbeafNufw5J4QXlLrrfBGzb3vTDK4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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