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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '887727ece9a6c23448279841689948c2308942e47c8faffe97eaf0b9b0ca82d8' 
  AND token = 'dm/Jf7LyJoE/GljAc6LyAtXsUqA8DbS0lCcnc5lEOkU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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