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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56256be9d1d53f8b4c9756eaa296fb7df0ab68cffdf43203aaefc84a20188f6a' 
  AND token = 'C4fmR/Ft7THl6rXGOZnJ9Ri0Js+IYuxltgmEaPUbrZ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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