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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0e7e757d4065becbd99177c02ca8ddd279155d3fbe7006885a1b4828b5d979c' 
  AND token = 'F0YI1xMNlsOrw5y1h8T87TU1RAxFVpy54gItnjKuTig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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