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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6388aac934fd435f34c8a37a1e2140cbc1f3446890836b9b13c512eee5eb2c5' 
  AND token = '/Q3y6WxvpDUDyZTEqco6JVS+hXxYRX26Nz4HHYh7CPc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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