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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3d5ff54f960d6f7a4b4ca262c4fcb3005a8c6e8156df1d7f9f0f56a68418bb7' 
  AND token = 'adCQ4wn3j8A2V9sLX73CSQvXdniRMceQ40IZjBaMquc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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