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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c02f4e9b3bfce4ea08a2f572f8e3990c8dc3093d3239509f0f54955a0f42b73' 
  AND token = 'FgL4X3blv5aQI579Mo8b62sHJkuKSkMoIqM+VHRFgmU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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