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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f03a6ccb6d7e2189371513762daca88a55bacdc5e9a2579d48be010e45b61d12' 
  AND token = 'GHbkcnnxgtr241qkKZK6g/s89lZmdnfGc27zLS+GFWU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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