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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c38bf03f9686fc0736565d52b0f49843a5915100f7873b35865c18ab230db24' 
  AND token = '2ttbfJnG+EVvC8eix2/Ej90G9kX/TvvgHL560y4JTU4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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