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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d956c46f96018a765c3847f89d2a439bdd058e7381fc9a7873be2e3e490a355' 
  AND token = '8+UpnXsuhtjrEi+gLPqqLQsX0yetuTFmumE1la4G0Po=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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