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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd90d0c34ea1bca2d584ecd33cabd7f33dc3eb7d0ee6c798d36c97e1c85852d7' 
  AND token = '6gaA0brOIucrZR+I1X5Iaf6tC8/wFkrsnr+kCyqcMWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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