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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2dfbaaf21970fb94cb82208e6271290677a0f355eb6b25e7bed11f2c20910a3' 
  AND token = 'WxYwvO47Ao0s4hkfxA9frrxKNojOX6LG0r30h11d8bk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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