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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bea454b072ac5fd169d15ed3f0bbddfc551be05fb616d764ec4a1c8f0703f2d' 
  AND token = 'rmjGypCXW7sPMvgiq0IKGA2XWs5lOpfU2vU62mqaqJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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