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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc705e1ead3cd8fc0f507a666a10bddb5eb2d04ad06fab2913ef381b34dffa4e' 
  AND token = 'xiK4wtYogaJ7EjG9SBMdrWYkNbv8HTPNz8DySkCazX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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