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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa64e3f901558d52ee1a2e704e2359f6f1baeeeddd5cba9ec3c8d56e8b274f9a' 
  AND token = 'Q9di5S/KRsSUo3lPCf8aW7IBQxX94jqP366qOuR0uzo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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