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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58c268c843122103b3ecdcc15a26fe768e1aecf7cbfd11b4cdc1bf09136a7bbf' 
  AND token = 'l0fn6TDJv2SLLorrEypBY2siILt1zbaGpWX5dCE0ck0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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