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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '158038a26f5c1256568ec90ad50eb9285160a3511273c8c2d58d5d202accdd08' 
  AND token = 'NiJd/w6ICYsLbwimkPJOIBkmbDHBg1849IlK+TyaUP4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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