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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '523d8ec4a1e951e767e33dc54b898cacb2acd11ba2b8c05d12bd9ff3f8c551d2' 
  AND token = 'SEUh/nDH37fslY9iFrVepQYbz/WgtAXKrJFgz9+hsb4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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