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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca3d48baec1298dfd66f32610836e141ad1661bfefa8974ef4878f32be166ea0' 
  AND token = 'kCG8crMDX3X9A/1jlpIByhtq/xgvFGYdK0Q2eWqNPSM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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