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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc87446d05353c317ae8082e07ec9d8e824347509d87464ed38da5545d1a8ea0' 
  AND token = 'ELydkOeB7Nh98u7RHJDv8hD+M3nQ43A2v80PoOzyIto=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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