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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60f110f06b11ff23fe162867e6af0833472ec178eef5e6e9d8f5c93202c8d7a0' 
  AND token = 'Jnn8hIJBr3hh92UZ8PNeXPK55lbebpayLb+KTQXblxA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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