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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '929b469f27564071e08e1cea9f15219c886b79761063f44b1a3bc21717b5f9ea' 
  AND token = 'a7Zb4qULeNgmkZ4F9O35vZvsEI1cq56G2X41D+PISwI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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