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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1afb8937659f45ecb25167d6086807456a1346f30ddde0cc3c7abcdb57c0e3d' 
  AND token = '2U09Qh3oGSsysfCcszOf2zQU7qUXdfV6/3+r/MEyg8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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