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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac56cad6aa68845c87b04ac90a5954629b341a8d6850a2576e17f92dfc5524b9' 
  AND token = '5SQgKa1n1nEVTQlGbkIXhxXyW7rs+QpTayai1CKlTJU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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