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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82e064e13bb647b865438cf9a19eb5924622ff267d3173d84488ec699bb380ac' 
  AND token = 'tfiGThGdJvn7fAR8MK6sbZyogK9a1arvcND4NnNY9LA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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