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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e2dbc0985a31640102854264364d0581b9e5741f1df6c9cca2a9d9eb8401ee9' 
  AND token = '8d/j3LxOvFDugdvjaVvWyzcjkqVE82b/pW3BjbuVNDI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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