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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92da23715dc70e8578ab4c926299842fb1e82bc2f56a77994570aa84c9e7c74e' 
  AND token = '/7oDSDAr0Cn1VyEKMKKrjVncybK/SoYysvbECdKFGVY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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