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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '856fa749555bfc966cc6f89a2ff10396a4c93b93f3751339b58830f7d2e0c6b4' 
  AND token = 'EmEVpTH0YvvB58qfMJSkolyOl3pTItl/LJi1kN4J0NI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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