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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8e84e4fe70eab343a46b692b2be8dc7be1a68b673eb3bbd505efb240e64b1ea' 
  AND token = 'bopDwbGfyHf5y3i4sXe62QHCX7V0Na2D8Znlr6YkywU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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