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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89d39c5015fadcc7ff4be39d066145531eb1b237ce1443507501bc3ce1a46c8c' 
  AND token = '+611Y49JMH8vPGQxT5CwP+y+GlF75FgQvWGo70Aoc10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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