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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3beff6d4be502aedd38f0ce78d7f0b80199ace617db38fb93949748e96eb09bf' 
  AND token = 'Q0hE+HMzL7mSmZmW6tI7hCAYGkN0xZ8JYYwQa9l0GhM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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