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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c320e5c9e5442ca888585a04974215e8c9f82627d3f1011ea055883416c017b' 
  AND token = 'phZujKgqyYmaC/0SIHrZq0ttqgLStYgrZGi5YOS1cC4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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