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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2994a9711a2de9343a2c058e5269b1ffa8285e33496fc75e2ea9906804b6b78' 
  AND token = 'l9UCLeMWoC9wIX7/1ea6/5d3in67nQwinqJoUxtH7PE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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