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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85984def52c8a7faee60e7bca6aa2af36e260802680b1d89e716ee11b7aa2660' 
  AND token = '79500GSdNqmSq8XgQ1Pnr4/0Fn+448Y3h5ATsnI3Cww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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