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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd7635e65d3064601d5b0caf2752e1fa8358925958236c4de7d415042bdf0a1c' 
  AND token = 'ndbkV8sTEmGQ7ddjPNxokZ3H7BW6ZeBgCob3wAteH9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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