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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11a58bc4c674217dda85fde0a41a3b55447a3b24a8dc4ca88af34729d5f287a0' 
  AND token = 'Rp3fTEf6OXIxeWszpRfl0FG3KH4f1W65RIidhSLFaNI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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