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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1d08604f15e28f5016af302596f8473436f55d8d477664bc1d2093b2193d872' 
  AND token = '4IYAlppscFFRaL9YC9uRBI63EgTTL085BTXz/k3PBR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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