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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92528f15e922a0638e41b10772fbe6f7254f9e224b8e92a4bb0821e72e8edbae' 
  AND token = 'C2uxtIpxcqky3r8M7lc76PJbfSpBcTgTqvdxdaTlVJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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