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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e862c90158668c947a71c4c45495fd8339b1c9766a2e58369514b5b248294c8' 
  AND token = 'yGGO/pgWVP2E90x5uE8UVl+AbJH4nb+Fa/fsHscUk7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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