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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fb6fc40658326c04038cd483b418d7444d45068467b06778f2a63056b5def71' 
  AND token = 'PibrKQrPaI+Bmev2BdeEAXIPrE2pfeFVtHh+W7D0Im8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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