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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96ed448332e9a62c2e3cb4dec44e135ee262193c32fe015cf5f6f29bd6f13c11' 
  AND token = 'FrJQRUCI6AWVjaL9/N2IzdsVit993kGi+w+VMHrYBkE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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