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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ba58e8861c4e184050fd0f5ec71ba2df0dfbeb5e5332df5d24245fca125ba00' 
  AND token = 'lLt3VoRyIaNAkdgK6jR/ryMkp4VOfAC63rdGM+Uth+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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