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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bd7f2a0f0592bee5d44dd239c56472a9df3b1f32a48a32759d02c432f6964cc' 
  AND token = 'zpNcF4ZzZpeIqCdeXzATbftHn/GXQmJw3ajVzdIS1Xk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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