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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2ff484ecb4e1f3a8b2c3d2d0580d85638216a9cd09e81002fb2db315d2857af' 
  AND token = 'WfgMb91Z89m93wXyiHn7h3kAMNTrfdJmROf4IVuYl2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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