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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad4f7d3ee95b56f6340bfb9e83b348482b0a4cadce25c32747c77c2473a7fcf3' 
  AND token = 'kMoj0W2sfOxpxMfm1OC42rohe4Ctf5lOgKb80ZZ3ZbM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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